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NFSv4: Fix a reboot recovery race when opening a file 

If the server reboots after it has replied to our OPEN, but before we
call nfs4_opendata_to_nfs4_state(), then the reboot recovery thread
will not see a stateid for this open, and so will fail to recover it.

Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
This commit is contained in:
Trond Myklebust 2013-02-07 14:26:21 -05:00
parent 65b62a29f7
commit c21443c2c7
1 changed files with 38 additions and 12 deletions
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50
fs/nfs/nfs4proc.c
View File

@ -1848,6 +1848,43 @@ static inline void nfs4_exclusive_attrset(struct nfs4_opendata *opendata, struct
sattr->ia_valid |= ATTR_MTIME;
}
static int _nfs4_open_and_get_state(struct nfs4_opendata *opendata,
fmode_t fmode,
int flags,
struct nfs4_state **res)
{
struct nfs4_state_owner *sp = opendata->owner;
struct nfs_server *server = sp->so_server;
struct nfs4_state *state;
unsigned int seq;
int ret;
seq = raw_seqcount_begin(&sp->so_reclaim_seqcount);
ret = _nfs4_proc_open(opendata);
if (ret != 0)
goto out;
state = nfs4_opendata_to_nfs4_state(opendata);
ret = PTR_ERR(state);
if (IS_ERR(state))
goto out;
if (server->caps & NFS_CAP_POSIX_LOCK)
set_bit(NFS_STATE_POSIX_LOCKS, &state->flags);
ret = nfs4_opendata_access(sp->so_cred, opendata, state, fmode, flags);
if (ret != 0)
goto out;
if (read_seqcount_retry(&sp->so_reclaim_seqcount, seq)) {
nfs4_schedule_stateid_recovery(server, state);
nfs4_wait_clnt_recover(server->nfs_client);
}
*res = state;
out:
return ret;
}
/*
* Returns a referenced nfs4_state
*/
@ -1892,18 +1929,7 @@ static int _nfs4_do_open(struct inode *dir,
if (dentry->d_inode != NULL)
opendata->state = nfs4_get_open_state(dentry->d_inode, sp);
status = _nfs4_proc_open(opendata);
if (status != 0)
goto err_opendata_put;
state = nfs4_opendata_to_nfs4_state(opendata);
status = PTR_ERR(state);
if (IS_ERR(state))
goto err_opendata_put;
if (server->caps & NFS_CAP_POSIX_LOCK)
set_bit(NFS_STATE_POSIX_LOCKS, &state->flags);
status = nfs4_opendata_access(cred, opendata, state, fmode, flags);
status = _nfs4_open_and_get_state(opendata, fmode, flags, &state);
if (status != 0)
goto err_opendata_put;